Door panel

It varies from vehicle to vehicle but first look for screws to remove (behind door release handle, behind little caps of main door handle and surrounding speakers of in door and along the sides and bottom of door) and there may be clips also that either unlock by prying the center out or the types that you need to gently pry/wiggle/rotate to work ot out without breaking it. From there you may be able to slide the door panel fowards or backwards or possibly strait up. Then be aware that there will be a clip on the rod for the release handle (that you rotate off the clip to unlock then pop up and out), wiring for window/lock controls and courtesy lights that may ot may not be in the door. Take your time you shouldnt have to force anything